This is probably reasonably considered a bug. :)
On Thursday, November 19, 2009, Dave Herman <dherman at ccs.neu.edu> wrote:
>> So what you have run into is an annoying and obscure feature, but a
> documented and apparently intentional one.
>>> I think the error message could be more suggestive, and those docs are pretty impenetrable. But I'm glad it's cleared up. Thanks for the help!
>> Dave
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